Pilot FriXion Light Erasable Highlighter - 6 Color Set - JetPens.com

These amazing FriXion Light highlighters are erasable! While highlighting textbooks and notes, sometimes you might accidentally highlight the wrong word, or you might over-highlight a chapter and want to un-highlight certain sections. If you're using the FriXion Light highlighters, that's no problem, because you can erase your highlighting! Simply use the rubber "eraser" tip at the top of the highlighter. The ink disappears cleanly, and there are no eraser shavings.
The highlighters are eco-friendly too, made of 87% recycled materials.

FriXion ink is a thermosensitive ink that can be erased by rubbing. Interestingly, erased ink reappears at temperatures below 14° F (-10° C). A freezer is cold enough to make this happen. Due to the thermosensitive nature of FriXion ink, we advise against using it for mailings, or leaving the written materials in hot cars or in environments that expose them to a lot of friction.